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3 years ago

Ideas of the atom have changed over time.

Chemistry

2 answers:

vesna_86 [32]3 years ago

8 0

Answer:

An atom is solid material.

Explanation:

The state of matter of an atom is neither solid, liquid nor gases. Matter is an aggregate of atoms which exists in physical states of solid, liquid or gases.

This idea of an atom is inacurate and widely regarded as inconsistent.

The other options are correct assumptions of an atom.

Electrons are subatomic particles that carries negative charges on them.

Electrons orbits the nucleus which is the center of an atom in discrete layers called orbitals.

Dahasolnce [82]3 years ago

8 0

An atom is a solid material.

Explanation : Atomic theory depicts how atom has changed over time. The first atomic model theory was given by JJ Thomson in the year 1904. An atom as a solid material is now believed as imprecise by the scientists. It is believed that an atom has a nucleus that is located at its center surrounding to which are the orbits where electrons are present.

Electrons are negatively charged particle. The nucleus has protons (positively charged) and neutrons (negatively charged) in it.

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conclusions: how is the difference in the physical properties of the powdered mixture components being used to separate them in

Advocard [28]

Sedimentation and Decantation is the process of setting of solid particles from a liquid either to produce a concentrated slurry or to clarify a liquid containing solid particles . The solid must not be mixed with liquid. For example- sand insoluble in water
Sublimation - In this process solid phase is directly transformed into vapour form without passing through liquid phase.This method is used in the purification of those substances which have sublimation property. At first the mixture should be sublimed before dissolution in liquid.
EX- Iodine , naphthalene, ammonium chloride etc. Here, NH4Cl is seperated by sublimation.
Evaporation is a technique used to separate out homogeneous mixtures where there is one or more dissolved salts. The process convert the liquid components from the solid components. The process typically involves heating the mixture until no more liquid remains.
so, now by evaporation of the liquid solvent we finally get the salt that was dissolved in it that is NaCl.

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8 0

2 years ago

What information does the potential energy diagram reveal about a reaction?

Marina CMI [18]

Answer: It shows whether the reaction is exothermic or endothermic.

Explanation:

If the potential energy of the products is greater than that of the reactants, then the reaction is exothermic.
If the potential energy of the reactants is greater than that of the products, then the reaction is endothermic.

3 0

2 years ago

The melting point of sugar is 186°C. At room temperature, in which state is sugar found

Viktor [21]

Answer:

solid

Explanation:Sucrose is a solid at STP, which stands for standard temperature and pressure.

8 0

3 years ago

How many grams of hydrogen reacts with 32 g of oxygen to produce 34 g of hydrogen peroxide

nordsb [41]

Answer:

2 grams.

Explanation:

H2 + O2 ---> H2O2

Using molar masses:

2*1 g hydrogen reacts with 2*16 g oxygen.

so 2g H2 reacts with 32 g O2.

8 0

3 years ago

How many grams of molybdenum(Mo) are in 2.68E24 atoms of Mo?

loris [4]

<h3>Answer:</h3>

427 g Mo

<h3>General Formulas and Concepts:</h3>

<u>Chemistry</u>

<u>Atomic Structure</u>

Reading a Periodic Table
Using Dimensional Analysis
Avogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.

<u>Pre-Algebra</u>

Order of Operations: BPEMDAS

Brackets
Parenthesis
Exponents
Multiplication
Division
Addition
Subtraction

Left to Right

<h3>Explanation:</h3>

<u>Step 1: Define</u>

2.68E24 atoms Mo or 2.68 × 10²⁴ atoms Mo

<u>Step 2: Identify Conversions</u>

Avogadro's Number

Molar Mass of Mo - 95.94 g/mol

<u>Step 3: Convert</u>

<u /> $2.68 \cdot 10^{24} \ atoms \ Mo(\frac{1 \ mol \ Mo}{6.022 \cdot 10^{23} \ atoms \ Mo} )(\frac{95.94 \ g \ Mo}{1 \ mol \ Mo} )$ = 426.966 g Mo

<u>Step 4: Check</u>

<em>We are given 3 sig figs. Follow sig fig rules and round.</em>

426.966 g Mo ≈ 427 g Mo

3 0

3 years ago